com.sun.javafx.scene.GroupHelper Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.javafx.scene;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.util.Utils;
import javafx.geometry.Bounds;
import javafx.scene.Group;
import javafx.scene.Node;
/**
* Used to access internal methods of Group.
*/
public class GroupHelper extends ParentHelper {
private static final GroupHelper theInstance;
private static GroupAccessor groupAccessor;
static {
theInstance = new GroupHelper();
Utils.forceInit(Group.class);
}
private static GroupHelper getInstance() {
return theInstance;
}
public static void initHelper(Group group) {
setHelper(group, getInstance());
}
@Override
protected NGNode createPeerImpl(Node node) {
return super.createPeerImpl(node);
}
@Override
protected Bounds computeLayoutBoundsImpl(Node node) {
groupAccessor.doComputeLayoutBounds(node);
return super.computeLayoutBoundsImpl(node);
}
public static void setGroupAccessor(final GroupAccessor newAccessor) {
if (groupAccessor != null) {
throw new IllegalStateException();
}
groupAccessor = newAccessor;
}
public interface GroupAccessor {
Bounds doComputeLayoutBounds(Node node);
}
}
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